Propeller



B. SCHMELZER.

PROPELLER.

APPLICATION FILED JUNE 26. I9I9.

Patented Mar. 29, 1921.

Summa:

BRUNO SCHIVIELZER, OF JERSEY CTY, NEV JERSEY.

PROPELLER.

Application filed June 26, 1919.

To all whom it may concern:

Be it known that l, BRUNO SGHMELZER, citizen of the Republic of Foland,residing at Jersey City, county of Hudson, and State of New Jersey, haveinvented certain new and useful Improvements in Propellers, of which thefollowing is a specification.

This invention relates to a propeller adapted for use on aeroplanes,flying machines, dirigibles, motor boats or the like, the 'presentinvention being an improvement on that described in a prior patentissued to me on September 12th, 1916, under No. 1,197,766.

The invention has for an object to provide a simple and efficientpropeller construction by which a high degree both of tractive andlifting force may be exerted.

For further comprehension of the invention, and of the objects andadvantages thereof, reference will be had to the following descriptionand accompanying drawings, and to the appended claims in which thevarious novel features of the invention are more particularly set forth.

Figure 1 of the drawings is a plan view of a propeller constructedaccording to my invention.

Fig. 2 is a side elevation thereof.

Fig. 3 is a detail horizontal section on the line 3 3 of Fig. 2. A

Fig. 4t is a diagrammatic view showing the means for shifting thehousing.

My improved propeller may be mounted in any desired manner suitable tothe structure to which it is to be applied, being here shown as mountedon the upper ends of standards 1 which may project from any car or bodystructure of the aeroplane, or other vehicle, to which the propeller isapplied.

The propeller proper comprises a series of hollow vanes 3, of whichthree are here shown, which radiate from a hub 4.

Considered in transverse section each vane is of generally triangularshape and is formed by two convexed side members 5 and 6 which inclineinwardly toward one another, the space between the rear edges of thesemembers being left open.

As seen in rear elevation the outer edges of the members 5 and 6 extendoutwardly from the hub 4f parallel to each other for somewhat more thanhalf the length of the vane and then incline inwardly toward one anotheras at 5 and 6 to meet at the tip of the vane.

Specification of Letters Patent.

Patented Mar. 29, i921.

Serial No. 306,897.

As seen in side elevation the forward edge of the vane extends radiallyoutward throughout its length while the rear edge curves gradually awayfrom the hub at an angle to the front edge as at 8 and finally curvesinwardly as at 9 to meet the front edge.

flhe propeller may be driven from any suitable source of power which maybe transmitted to the propeller by a bevel gear 10 fixed on the shaft 11on which the hub 1 is mounted.

A semi-circular housing 12 cooperates with the propeller, this housingbeing of a size and shape to inclose the propeller and being mountedconcentrically thereto on the standards 1, the housing having hubs 13which support the shaft and are in turn supported in suitable bearingsin the standards.

The housing may be adjusted around the propeller by means of a worm gear14 fixed to one of the housing hubs 13 and engaged by a worm pinion 15on one end of a shaft 16, the opposite end of said shaft having a handle17 whereby it may be manually rotated to shift the housing.

As will be apparent the housing may be shifted around the propeller tooccupy any position desired so as to cause the beat of the vaines on theair to drive the vehicle in which it is mounted horizontally or cause itto ascend or descend.

Having thus described my invention what l claim as new and desire tosecure by Letters Patent, is

1. A. propeller comprising a hub, and a vane on said hub consisting of apair of side members which in cross section are convexly curved andinclined to a common point centrally between the sides of the vane, theopposed edges of said members extending outwardly from the hub parallelto each other for a portion of the length of the vane and then inclininginwardly toward one another to meet at the tip of the vane.

2. A propeller comprising a hub, and a vane on said hub consisting of apair of side members which in cross section are convexly curved andincline to a common point centrally between the sides of the vane, thespace between the opposed edges of said members being open, the saidopposed edges extending outwardly from the hub parallel to each otherfor slightly more than onehalf the length of the vane and then inclininginwardly toward one another to meet at the tip of the vane, said membersextending radially outwardly on their advancing side the opposite sidecurving` from the hase to the tip of the vane just outwardly 'from andthen inwardly toward the :first side.

3. A propeller having a vane Consisting of a pair of eonveXly Curvedside members which incline to a common point central between the sidesof the vane, the space be- 10 tween the separated edges of said membersbeing open, said membersV extending radially outwardly on theiradvancing` side, the opposite side curving from the base to the tip ofthe vane first outwardly from and then inwardly toward the irst side.

ln testimony whereof, have signed my name to this specification this 3rdday of June, 1919.

BRUNO SCHMELZER.

